Bright (uncoated)





E2781.1/8
UNF Machine Tap Straight Flute
Material ID: 5975099
Straight flute tap with chamfer form C with a 2-3xP plug lead, for Unified National Fine thread UNF 1.1/8" with 12 TPI and 2B class of fit, dimensions according to DIN 374 standard with 22.0mm shank and 18.0mm square drive, powder metallurgical HSS-E with bright finish for 1.5xD through or blind hole threading in free machining and plain carbon steel
Product Feature


Thread Form, Unified Fine

DIN 374 – MF Thread Standard

Internal Inch Thread Medium Class of Fit

Through or Blind Hole Application

1.5×D Usable Tool Depth to Diameter Ratio

High Speed Cobalt Powder Metal Tool Material

Semi-Bottoming Tap Chamfer (2 – 3 Pitch Lead)

Straight Flute Geometry

Right Hand Rotation / Cutting
Product Detail
Description | Value |
---|---|
Product name | E2781.1/8 |
Product number (SAP) | 86015974 |
EAN number | 7320760089590 |
Thread diameter size (TDZ) | 1.1/8 |
Thread diameter - millimeter (TD) | 28.58 mm |
Threads per inch (TPI) | 12 |
Overall length - millimeter (OAL) | 150 mm |
Overall length - inch (OAL) | 5.9055 inch |
Threading length - millimeter (THL) | 28 mm |
Threading length - inch (THL) | 1.1024 inch |
Connection diameter - inch (DCON MS) | 0.8661 inch |
Connection diameter - millimeter (DCON MS) | 22 mm |
Flute count (NOF) | 4 |
Clamping width - inch (WSC) | 0.7087 inch |
Clamping width - millimeter (WSC) | 18 mm |
Clamping Length - inch (LCS) | 0.8268 inch |
Clamping Length - millimeter (LSC) | 21 mm |
Premachined hole diameter - inch (PHD) | 1.0433 inch |
Premachined hole diameter - millimeter (PHD) | 26.5 mm |
Gross weight - grams | 435.6 |
ISO | E2781.1/8 |
Ordering code ANSI | E2781.1/8 |
Cutting Conditions
Suitability | vc | f | |
---|---|---|---|
P1.1 - Free machining sulfurized carbon steel with a hardness of < 240HB | Primary use | 11 m/min | |
P1.2 - Free machining sulfurized and phosphorized carbon steel with a hardness of < 180HB | Primary use | 12 m/min | |
P1.3 - Free machining sulfurized/phosphorized and leaded carbon steel with a hardness of < 180HB | Primary use | 12 m/min |
Suitability | vc | f | |
---|---|---|---|
P2.1 - Plain low carbon steel containing < 0.25%C with a hardness of < 180HB | Primary use | 9 m/min | |
P2.2 - Plain medium carbon steel containing < 0.55%C with a hardness of < 240HB | Primary use | 8 m/min | |
P2.3 - Plain high carbon steel containing > 0.55%C, with a hardness of < 300HB | Possible use | 7 m/min |
Suitability | vc | f | |
---|---|---|---|
P3.1 - Alloy steel with a hardness of < 180HB | Primary use | 7 m/min | |
P3.2 - Alloy steel with a hardness of 180 - 260HB | Possible use | 6 m/min |
Suitability | vc | f | |
---|---|---|---|
P4.1 - Tool steel with a hardness of < 26HRC | Possible use | 4 m/min |
Suitability | vc | f | |
---|---|---|---|
K1.1 - Gray iron, ferritic or ferritic-pearlitic with a hardness of < 180HB | Possible use | 13 m/min | |
K1.2 - Gray iron, ferritic-pearlitic or pearlitic with a hardness of 180 - 240HB | Possible use | 10 m/min | |
K1.3 - Gray iron, pearlitic with a hardness of 240 - 280HB | Possible use | 8 m/min |
Suitability | vc | f | |
---|---|---|---|
K2.1 - Malleable iron, ferritic with a hardness of < 160HB | Possible use | 14 m/min | |
K2.2 - Malleable iron, ferritic or pearlitic with a hardness of 160 - 200HB | Possible use | 11 m/min |
Suitability | vc | f | |
---|---|---|---|
K3.1 - Ductile (nodular/spheriodal) iron, ferritic with a hardness of < 180HB | Possible use | 13 m/min | |
K3.2 - Ductile (nodular/spheriodal) iron, ferritic or pearlitic with a hardness of 180 - 220HB | Possible use | 10 m/min |
Suitability | vc | f | |
---|---|---|---|
K4.1 - Austenitic cast iron with a hardness of < 180HB | Possible use | 12 m/min | |
K4.2 - Austenitic cast iron with a hardness of 180 - 240HB | Possible use | 9 m/min |
Suitability | vc | f | |
---|---|---|---|
K5.1 - Vermicular, compacted graphite iron with a hardness of < 180HB | Possible use | 12 m/min | |
K5.2 - Vermicular, compacted graphite iron with a hardness of 180 - 220HB | Possible use | 10 m/min |
Suitability | vc | f | |
---|---|---|---|
N1.3 - Wrought aluminium alloys with a hardness of 100 - 150HB | Possible use | 12 m/min |
Suitability | vc | f | |
---|---|---|---|
N2.1 - Cast aluminium alloys with a hardness of < 75HB | Possible use | 15 m/min | |
N2.2 - Cast aluminium alloys with a hardness of 75 - 90HB | Possible use | 14 m/min | |
N2.3 - Cast aluminium alloys with a hardness of 90 < 140HB | Possible use | 11 m/min |
Suitability | vc | f | |
---|---|---|---|
N3.1 - Free-cutting copper-alloys materials with excellent machining properties | Possible use | 21 m/min | |
N3.2 - Short-chip copper-alloys with good to moderate machining properties | Primary use | 14 m/min |
Suitability | vc | f | |
---|---|---|---|
N4.2 - Thermosetting polymers | Possible use | 8 m/min |